“This system of rocks, one of the oldest geological formations in India, dates back to the Archaean and Proterozoic eons, approximately 2.5 to 3.5 billion years ago. These rocks are primarily found in Karnataka and parts of Andhra Pradesh, Madhya Pradesh, and Tamil Nadu. These are rich in valuable minerals, particularly iron ore, manganese, gold, and copper, making them significant for India's mining industry. They mainly consist of metamorphic rocks such as schists and gneisses, formed through the intense heat and pressure over geological time. Additionally, these rocks exhibit folded and faulted structures, indicating ancient tectonic activities, and play a crucial role in understanding the early geological history of the Indian subcontinent.
On the basis of information given above, identify the rock system